CN107425556A - Battery balanced device and battery equalization method - Google Patents

Battery balanced device and battery equalization method Download PDF

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Publication number
CN107425556A
CN107425556A CN201611177237.2A CN201611177237A CN107425556A CN 107425556 A CN107425556 A CN 107425556A CN 201611177237 A CN201611177237 A CN 201611177237A CN 107425556 A CN107425556 A CN 107425556A
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CN
China
Prior art keywords
battery
voltage
control module
core
economize
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CN201611177237.2A
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Chinese (zh)
Inventor
李进
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Shanghai Lan-Service New Energy Technology Co Ltd
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Shanghai Lan-Service New Energy Technology Co Ltd
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Priority to CN201611177237.2A priority Critical patent/CN107425556A/en
Publication of CN107425556A publication Critical patent/CN107425556A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0016Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits

Abstract

The present invention provides a kind of battery balanced device and battery equalization method, battery balanced device includes control module, voltage acquisition module, power resistor and several switch modules, control module electrically connects with voltage acquisition module, voltage acquisition module electrically connects with some economize on electricity cores of battery pack, each economize on electricity core is corresponding with a switch module, and is electrically connected respectively with control module and power resistor by corresponding switch module.The present invention saves the quantity of power resistor, so as to be effectively reduced the manufacturing cost of battery balanced device and design cost, and substantially reduces circuit board size, preferably meets the requirement to spaces compact and aspect simple in construction in each application field.Meanwhile the present invention can also prevent power resistor from crossing cause thermal damage, play a part of protecting power resistor, and when excessively balanced, because the coil both end voltage of two-way relay be less than pick-up voltage scope, the automatic disconnection of switch, play certain protection and cross the effect of putting.

Description

Battery balanced device and battery equalization method
Technical field
The present invention relates to a kind of battery balanced device and battery equalization method, the passive balanced dress of more particularly to a kind of battery Put and method.
Background technology
Battery does not have absolute uniformity, and after in groups, the capacity volume variance between battery will shadow beyond certain threshold value The actually available capacity of whole battery pack is rung, so, battery is in life-span of the life-span later in groups well below cell, master It is the individual difference between battery to want reason, and when causing charging, the maximum battery of capacity easily overcharges, and during electric discharge, capacity is minimum Battery again easy mistake put, into vicious circle so that Individual cells are damaged, and influence the charge-discharge characteristic of whole battery pack, electricity Pond pool-size reduces.In order to extend the service life of battery pack, it is necessary to carry out equilibrium to the battery of difference.
At present, there are two kinds of battery balanced modes, respectively active equalization and passive equilibrium.Active equalization energy loss is small, But circuit is complicated, cost is higher, therefore at present or conventional passive balanced.It is but passive balanced typically with each economize on electricity A switch in parallel and a power resistor on pond, by taking 48V lithium titanate batteries as an example, it is made up of 20 economize on electricity cores, it is desirable to 20 Individual power resistor, except increasing cost, it also greatly increases circuit board size.Spaces compact and simple in construction is being advocated now Auto age, it is out of season.In addition by the way of simultaneously balanced, circuit board heating can be caused or even burn out component.
The content of the invention
The technical problem to be solved in the present invention is to overcome the passive balancer cost of idleness of battery in the prior art, is increased A kind of the defects of adding circuit board size, and being likely to result in circuit board heating or even burn out component, there is provided battery balanced device And battery equalization method.
The present invention is that solve above-mentioned technical problem by following technical proposals:
A kind of battery balanced device, its feature are that the battery balanced device includes control module, voltage acquisition mould Block, power resistor and several switch modules, the control module electrically connect with the voltage acquisition module, the voltage acquisition Module electrically connects with some economize on electricity cores of battery pack, and each economize on electricity core is corresponding with a switch module, and passes through corresponding switch Module electrically connects with the control module and the power resistor respectively;
The voltage acquisition module is used for the magnitude of voltage for gathering each economize on electricity core respectively according to the first predeterminated frequency, and respectively Send to the control module, after magnitude of voltage of the control module for receiving each economize on electricity core, calculate several voltages The average voltage level of value, and the difference of each magnitude of voltage and the average voltage level is calculated respectively, the control module is also used It is more than the average voltage level in detection magnitude of voltage, and corresponding difference is more than the battery core of predetermined threshold value, and equalizing signal is sent out Switch module corresponding to the battery core detected is delivered to, the corresponding switch module is closed after receiving equalizing signal, made described The battery core detected electrically connects with the power resistor.
Detect that the magnitude of voltage of more piece battery core is more than the average voltage level it is preferred that working as, and corresponding difference is more than in advance If during threshold value, the control module sends equalizing signal into the more piece battery core detected corresponding to magnitude of voltage highest battery core Switch module;
It is preferred that when magnitude of voltage highest battery core is that n is saved in the more piece battery core detected, n is described more than or equal to 2 Control module sends equalizing signal according to the second predeterminated frequency economize on electricity core to n in switch corresponding to the different battery core of any one section Module, second predeterminated frequency is more than or equal to 5ms, and is less than first predeterminated frequency.
In this programme, for the time balanced to battery core can not be too short consideration, second predeterminated frequency should be big In or equal to 5ms.
It is preferred that first predeterminated frequency is 10ms;And/or
The control module is MCU (Micro Control Unit, micro-control unit);And/or
The voltage acquisition module by CAN (Controller Area Network, controller local area network) buses with The control module electrical connection.
It is preferred that each switch module includes two-way relay and metal-oxide-semiconductor (Metal-Oxide- Semiconductor, Metal-oxide-semicondutor), each economize on electricity core by the double-pole switch of corresponding two-way relay with The power resistor electrical connection, and pass through the coil of corresponding two-way relay and corresponding metal-oxide-semiconductor and control module electricity Connection.
In this programme, when the voltage of battery core is dropped to below the rated voltage of two-way relay, in the control module Before also not sending open command, two-way relay can first disconnect switch, so as to prevent putting.
It is preferred that the battery balanced device also include PTC (Positive Temperature Coefficient, just Temperature coefficient) thermistor, the PTC thermistor is connected serially to the power resistor, and each economize on electricity core passes through corresponding switch Module electrically connects with the PTC thermistor.
In this programme, due to there was only a power resistor electric discharge, to prevent power resistor from overheating, gone here and there on power resistor Join a PTC thermistor, as temperature rise resistance can also raise, cause euqalizing current to diminish, can be with when equilibrium starts High current is balanced, improves balancing speed, and the phase can be balanced with low current after equalization, prevents the voltage of battery core from dropping to average voltage level Below.
A kind of battery equalization method, its feature are that the battery equalization method utilizes battery balanced device described above To realize, the battery equalization method comprises the following steps:
S1, the voltage acquisition module gather the magnitude of voltage of each economize on electricity core respectively according to the first predeterminated frequency, and respectively Send to the control module;
S2, after the control module receives the magnitude of voltage of each economize on electricity core, calculate the average voltage of several magnitudes of voltage Value, and the difference of each magnitude of voltage and the average voltage level is calculated respectively;
S3, control module detection magnitude of voltage be more than the average voltage level, and corresponding difference is more than predetermined threshold value Battery core, and equalizing signal is sent to switch module corresponding to the battery core detected, it is described corresponding to switch module receive Closed after equalizing signal, the battery core detected is electrically connected with the power resistor.
It is preferred that in step S3In, when the magnitude of voltage for detecting more piece battery core is more than the average voltage level, and it is corresponding When difference is more than predetermined threshold value, equalizing signal is sent the magnitude of voltage highest into the more piece battery core detected by the control module Switch module corresponding to battery core;
It is preferred that when magnitude of voltage highest battery core is that n is saved in the more piece battery core detected, n is described more than or equal to 2 Control module sends equalizing signal according to the second predeterminated frequency economize on electricity core to n in switch corresponding to the different battery core of any one section Module, second predeterminated frequency is more than or equal to 5ms, and is less than first predeterminated frequency.
In this programme, for the time balanced to battery core can not be too short consideration, second predeterminated frequency should be big In or equal to 5ms.
It is preferred that first predeterminated frequency is 10ms;And/or
The control module is MCU;And/or
The voltage acquisition module is electrically connected by CAN with the control module.
It is preferred that each switch module includes two-way relay and metal-oxide-semiconductor, each economize on electricity core passes through corresponding two-way The double-pole switch of relay electrically connects with the power resistor, and the coil by corresponding two-way relay and corresponding MOS Pipe electrically connects with the control module.
In this programme, when the voltage of battery core is dropped to below the rated voltage of two-way relay, in the control module Before also not sending open command, two-way relay can first disconnect switch, so as to prevent putting.
It is preferred that the battery balanced device also includes PTC thermistor, the PTC thermistor is connected serially to the work( Rate resistance, each economize on electricity core are electrically connected by corresponding switch module with the PTC thermistor.
In this programme, due to there was only a power resistor electric discharge, to prevent power resistor from overheating, gone here and there on power resistor Join a PTC thermistor, as temperature rise resistance can also raise, cause euqalizing current to diminish, can be with when equilibrium starts High current is balanced, improves balancing speed, and the phase can be balanced with low current after equalization, prevents the voltage of battery core from dropping to average voltage level Below.
It on the basis of common sense in the field is met, above-mentioned each optimum condition, can be combined, it is each preferably real to produce the present invention Example.
The positive effect of the present invention is:
The present invention saves the quantity of power resistor, so as to be effectively reduced the manufacturing cost of battery balanced device and be designed to This, and substantially reduces circuit board size, preferably meets in each application field to spaces compact and aspect simple in construction It is required that.Meanwhile the present invention can also prevent power resistor from crossing cause thermal damage, play a part of protecting power resistor, and when excessively balanced, Because the coil both end voltage of two-way relay is less than pick-up voltage scope, switch it is automatic disconnect, play certain protection and cross and put work With.
Brief description of the drawings
Fig. 1 is the battery balanced device of present pre-ferred embodiments and the circuit connection diagram of battery core.
Fig. 2 is the flow chart of the battery equalization method of present pre-ferred embodiments.
Embodiment
Name preferred embodiment, and become apparent from intactly illustrating the present invention with reference to accompanying drawing.
As shown in figure 1, the battery balanced device that the present embodiment provides includes 1, PTC thermistor of a power resistor 2nd, n switch module, voltage acquisition module 5 and control module, wherein, each switch module includes a two-way relay respectively Device and a metal-oxide-semiconductor group, each two-way relay include double-pole switch 31 and coil 32 respectively, and each metal-oxide-semiconductor group includes NMOS (N-Metal-Oxide-Semiconductor, N-type Metal-oxide-semicondutor) pipes 41 and PMOS (P-Metal- Oxide-Semiconductor, p-type Metal-oxide-semicondutor) pipe 42, in the present embodiment, the control module is MCU6, other process chips also can be selected certainly.
Voltage acquisition module 5 electrically connects with the n economize on electricity cores 7 of battery pack that need to be balanced respectively, each economize on electricity core 7 and one pair Road relay and metal-oxide-semiconductor group are corresponding, each economize on electricity core 7 respectively by corresponding double-pole switch 31 successively with power resistor 1 And PTC thermistor 2 electrically connects, power resistor 1 is connected with PTC thermistor 2, and each economize on electricity core 7 passes through corresponding line respectively Circle 32 and metal-oxide-semiconductor group are electrically connected with MCU6, and voltage acquisition module 5 is electrically connected by CAN with MCU6, in the present embodiment, Do not limit the quantity and model of all parts specifically, can be adjusted correspondingly according to actual conditions.
Specifically, voltage acquisition module 5 is used for the magnitude of voltage for gathering each economize on electricity core 7 respectively according to the first predeterminated frequency, And MCU6 is respectively sent to, in the present embodiment, first predeterminated frequency is set as 10ms, you can is considered whole device Poll time, certainly also can be according to actual conditions sets itself.After magnitudes of voltage of the MCU6 for receiving each economize on electricity core 7, meter The average voltage level of n magnitude of voltage is calculated, and calculates the difference of each magnitude of voltage and the average voltage level respectively, MCU6 is also used It is more than the average voltage level in detection magnitude of voltage, and corresponding difference is more than a section or more piece battery core 7 for predetermined threshold value, works as inspection When the battery core 7 measured is a section, MCU6 sends equalizing signal to metal-oxide-semiconductor group corresponding to the battery core 7 detected, when what is detected When battery core 7 is more piece, MCU6 sends equalizing signal into the more piece battery core detected corresponding to magnitude of voltage highest battery core 7 Metal-oxide-semiconductor group, when magnitude of voltage highest battery core 7 is that m is saved in the more piece battery core 7 detected, m is more than or equal to 2, MCU6 according to the Two predeterminated frequencies send equalizing signal metal-oxide-semiconductor group corresponding to the battery core 7 that any one section is different into m economize on electricity cores 7, but are in order at The time balanced to battery core can not be too short consideration, second predeterminated frequency is more than or equal to 5ms, and it is pre- to be less than described first If frequency, in the present embodiment, second predeterminated frequency is 5ms, you can in a polling time period, be can be transmitted twice Equalizing signal is to two magnitude of voltage highest battery cores 7.
Detailed description below carries out balanced flow to battery core.
With first battery core, i.e. G1Exemplified by the corresponding battery core in end, when not receiving equalizing signal, G1Hold as low level, it is right The NMOS tube 41 answered turns off, PMOS 42 turns on, S1With C1In the conduction state, now corresponding 32 no electric current of coil flows through, Therefore double-pole switch 31 corresponding to disconnects, and can not carry out equilibrium.When receiving equalizing signal, MCU6 makes G1Hold as high level, i.e., Put G1=" 1 ", S1With C1Disconnect, with C0Conducting, now coil 32 has electric current to flow through, and double-pole switch 31 closes, power resistor 1 and C1 Parallel connection, C1Electric discharge, it is balanced so as to be carried out to battery core.
In the present embodiment, due to only having a power resistor 1 to discharge, to prevent power resistor 1 from overheating, in power resistor One PTC thermistor 2 of series connection on 1, as temperature rise resistance can also raise, cause euqalizing current to diminish, start in equilibrium When can be balanced with high current, improve balancing speed, the phase can be balanced with low current after equalization, prevent battery core voltage drop to it is average Below magnitude of voltage.Meanwhile when the voltage of battery core is dropped to below the rated voltage of two-way relay, do not sent also in MCU disconnected Before opening instruction, two-way relay can first disconnect switch, so as to prevent putting.
As shown in Fig. 2 the present embodiment also provides a kind of battery equalization method, the battery equalization method is using described above Battery balanced device realizes that the battery equalization method comprises the following steps:
Step 101, voltage acquisition module gather the magnitude of voltage of each economize on electricity core every 10ms, and are respectively sent to control respectively Molding block.
Voltage acquisition module gathers the magnitude of voltage of each economize on electricity core according to the first predeterminated frequency respectively, in the present embodiment, First predeterminated frequency is set as 10ms, you can it is considered the poll time of one-shot battery equalization methods, certainly also can basis Actual conditions sets itself.
After step 102, control module receive the magnitude of voltage of each economize on electricity core, the average voltage level of n magnitude of voltage is calculated, And the difference of each magnitude of voltage and average voltage level is calculated respectively.
Step 103, control module detection magnitude of voltage are more than average voltage level, and corresponding difference is more than the one of predetermined threshold value Section or more piece battery core, and equalizing signal is sent into the section or more piece battery core detected corresponding to magnitude of voltage highest battery core Switch module, corresponding switch module close after receiving equalizing signal, and the battery core for making to detect electrically connects with power resistor.
Specifically, MCU detection magnitudes of voltage are more than average voltage level, and corresponding difference is more than a section or more of predetermined threshold value Economize on electricity core, and when the battery core detected is a section, MCU sends equalizing signal to metal-oxide-semiconductor group corresponding to the battery core detected, when When the battery core detected is more piece, equalizing signal is sent into the more piece battery core detected magnitude of voltage highest battery core pair by MCU The metal-oxide-semiconductor group answered, when in the more piece battery core detected magnitude of voltage highest battery core be m save when, m be more than or equal to 2, MCU according to Second predeterminated frequency sends equalizing signal metal-oxide-semiconductor group corresponding to the battery core that any one section is different into m economize on electricity cores, but is in order at The time balanced to battery core can not be too short consideration, second predeterminated frequency is more than or equal to 5ms, and it is pre- to be less than described first If frequency, in this method embodiment, second predeterminated frequency is 5ms, you can in a polling time period, be can be transmitted Equalizing signal is to two magnitude of voltage highest battery cores 7 twice.
Balanced flow is carried out in detailed description below this method embodiment to battery core.
With reference to shown in Fig. 1, with first battery core, i.e. G1Exemplified by the corresponding battery core in end, when not receiving equalizing signal, G1 Hold as low level, corresponding NMOS tube 41 turns off, PMOS 42 turns on, S1With C1It is in the conduction state, now corresponding coil 32 There is no electric current to flow through, therefore corresponding double-pole switch 31 disconnects, and can not carry out equilibrium.When receiving equalizing signal, MCU6 makes G1 Hold as high level, that is, put G1=" 1 ", S1With C1Disconnect, with C0Conducting, now coil 32 has electric current to flow through, and double-pole switch 31 closes Close, power resistor 1 and C1Parallel connection, C1Electric discharge, it is balanced so as to be carried out to battery core.
In this method embodiment, due to there was only a power resistor electric discharge, to prevent power resistor from overheating, in power electricity One PTC thermistor of series connection in resistance, as temperature rise resistance can also raise, cause euqalizing current to diminish, start in equilibrium When can be balanced with high current, improve balancing speed, the phase can be balanced with low current after equalization, prevent battery core voltage drop to it is average Below magnitude of voltage.Meanwhile when the voltage of battery core is dropped to below the rated voltage of two-way relay, do not sent also in MCU disconnected Before opening instruction, two-way relay can first disconnect switch, so as to prevent putting.
Battery balanced device and method that the present embodiment provides can save the quantity of power resistor, so as to be effectively reduced electricity The manufacturing cost and design cost of pond balancer, and circuit board size is substantially reduced, preferably meet each application field In requirement to spaces compact and aspect simple in construction.Meanwhile can also prevent power resistor from crossing cause thermal damage, play protection power electricity The effect of resistance, and when excessively balanced, because the coil both end voltage of two-way relay is less than pick-up voltage scope, switch from dynamic circuit breaker Open, play certain protection and cross the effect of putting.
Although the embodiment of the present invention is the foregoing described, it will be appreciated by those of skill in the art that this is only For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from On the premise of the principle and essence of the present invention, various changes or modifications can be made to these embodiments, but these changes and Modification each falls within protection scope of the present invention.

Claims (10)

  1. A kind of 1. battery balanced device, it is characterised in that the battery balanced device include control module, voltage acquisition module, Power resistor and several switch modules, the control module electrically connect with the voltage acquisition module, the voltage acquisition mould Block electrically connects with some economize on electricity cores of battery pack, and each economize on electricity core is corresponding with a switch module, and passes through corresponding switching molding Block electrically connects with the control module and the power resistor respectively;
    The voltage acquisition module is used for the magnitude of voltage for gathering each economize on electricity core respectively according to the first predeterminated frequency, and sends respectively To the control module, after magnitude of voltage of the control module for receiving each economize on electricity core, several magnitudes of voltage are calculated Average voltage level, and the difference of each magnitude of voltage and the average voltage level is calculated respectively, the control module is additionally operable to examine Survey magnitude of voltage and be more than the average voltage level, and corresponding difference is more than the battery core of predetermined threshold value, and by equalizing signal send to Switch module corresponding to the battery core detected, the corresponding switch module close after receiving equalizing signal, make the detection The battery core arrived electrically connects with the power resistor.
  2. 2. battery balanced device as claimed in claim 1, it is characterised in that when the magnitude of voltage for detecting more piece battery core is more than institute Average voltage level is stated, and when corresponding difference is more than predetermined threshold value, the control module sends equalizing signal to detecting Switch module corresponding to magnitude of voltage highest battery core in more piece battery core;
    It is preferred that when magnitude of voltage highest battery core is that n is saved in the more piece battery core detected, n is more than or equal to 2, the control Module sends equalizing signal according to the second predeterminated frequency economize on electricity core to n in switching molding corresponding to the different battery core of any one section Block, second predeterminated frequency is more than or equal to 5ms, and is less than first predeterminated frequency.
  3. 3. battery balanced device as claimed in claim 1, it is characterised in that first predeterminated frequency is 10ms;And/or
    The control module is MCU;And/or
    The voltage acquisition module is electrically connected by CAN with the control module.
  4. 4. battery balanced device as claimed in claim 1, it is characterised in that each switch module includes two-way relay And metal-oxide-semiconductor, each economize on electricity core are electrically connected by the double-pole switch of corresponding two-way relay with the power resistor, and by right The coil and corresponding metal-oxide-semiconductor for the two-way relay answered electrically connect with the control module.
  5. 5. the battery balanced device as described in any one in Claims 1 to 4, it is characterised in that the battery balanced device Also include PTC thermistor, the PTC thermistor is connected serially to the power resistor, and each economize on electricity core passes through corresponding switch Module electrically connects with the PTC thermistor.
  6. 6. a kind of battery equalization method, it is characterised in that the battery equalization method is equal using battery as claimed in claim 1 Device weigh to realize, the battery equalization method comprises the following steps:
    S1, the voltage acquisition module gathers the magnitude of voltage of each economize on electricity core according to the first predeterminated frequency, and is respectively sent to respectively The control module;
    S2, after the control module receives the magnitude of voltage of each economize on electricity core, calculate the average voltage level of several magnitudes of voltage, and The difference of each magnitude of voltage and the average voltage level is calculated respectively;
    S3, control module detection magnitude of voltage be more than the average voltage level, and corresponding difference is more than the electricity of predetermined threshold value Core, and equalizing signal is sent to switch module corresponding to the battery core detected, the corresponding switch module and receives equilibrium Closed after signal, the battery core detected is electrically connected with the power resistor.
  7. 7. battery equalization method as claimed in claim 6, it is characterised in that in step S3In, when the electricity for detecting more piece battery core Pressure value is more than the average voltage level, and when corresponding difference is more than predetermined threshold value, the control module sends equalizing signal The switch module corresponding to magnitude of voltage highest battery core into the more piece battery core detected;
    It is preferred that when magnitude of voltage highest battery core is that n is saved in the more piece battery core detected, n is more than or equal to 2, the control Module sends equalizing signal according to the second predeterminated frequency economize on electricity core to n in switching molding corresponding to the different battery core of any one section Block, second predeterminated frequency is more than or equal to 5ms, and is less than first predeterminated frequency.
  8. 8. battery equalization method as claimed in claim 6, it is characterised in that first predeterminated frequency is 10ms;And/or
    The control module is MCU;And/or
    The voltage acquisition module is electrically connected by CAN with the control module.
  9. 9. battery equalization method as claimed in claim 6, it is characterised in that each switch module includes two-way relay And metal-oxide-semiconductor, each economize on electricity core are electrically connected by the double-pole switch of corresponding two-way relay with the power resistor, and by right The coil and corresponding metal-oxide-semiconductor for the two-way relay answered electrically connect with the control module.
  10. 10. the battery equalization method as described in any one in claim 6~9, it is characterised in that the battery balanced device Also include PTC thermistor, the PTC thermistor is connected serially to the power resistor, and each economize on electricity core passes through corresponding switch Module electrically connects with the PTC thermistor.
CN201611177237.2A 2016-12-19 2016-12-19 Battery balanced device and battery equalization method Pending CN107425556A (en)

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CN108199577A (en) * 2017-12-21 2018-06-22 重庆菲力斯特科技有限公司 DC high-voltage power supply decompression control device, method and DC high-voltage power supply dropping equipment
CN108418274A (en) * 2018-04-02 2018-08-17 广州昂宝电子有限公司 Multiport battery charger
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CN105429212A (en) * 2015-12-01 2016-03-23 深圳奥特迅电力设备股份有限公司 Battery pack voltage equalization control circuit and battery management equipment
CN105896656A (en) * 2016-04-18 2016-08-24 安徽锐能科技有限公司 Bidirectional equalization circuit

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CN108199577A (en) * 2017-12-21 2018-06-22 重庆菲力斯特科技有限公司 DC high-voltage power supply decompression control device, method and DC high-voltage power supply dropping equipment
CN108418274A (en) * 2018-04-02 2018-08-17 广州昂宝电子有限公司 Multiport battery charger
CN108418274B (en) * 2018-04-02 2022-04-29 广州昂宝电子有限公司 Multi-port battery charger
CN108631413A (en) * 2018-07-04 2018-10-09 樊朝晖 A kind of battery protecting apparatus and its method based on blocking type PTC
CN112009309A (en) * 2019-05-13 2020-12-01 北京车和家信息技术有限公司 Equalization circuit, design method thereof and battery management system
CN112009309B (en) * 2019-05-13 2022-05-03 北京车和家信息技术有限公司 Equalization circuit, design method thereof and battery management system
CN114465327A (en) * 2022-03-22 2022-05-10 西安工业大学 Multi-path selection battery electric quantity balance control method and device

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Application publication date: 20171201